EP1275457B1 - Drill bit - Google Patents
Drill bit Download PDFInfo
- Publication number
- EP1275457B1 EP1275457B1 EP00979974A EP00979974A EP1275457B1 EP 1275457 B1 EP1275457 B1 EP 1275457B1 EP 00979974 A EP00979974 A EP 00979974A EP 00979974 A EP00979974 A EP 00979974A EP 1275457 B1 EP1275457 B1 EP 1275457B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting blade
- drill bit
- blade tip
- bit body
- bit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
- B28D1/146—Tools therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/005—Cylindrical shanks of tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/75—Stone, rock or concrete
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2231/00—Details of chucks, toolholder shanks or tool shanks
- B23B2231/02—Features of shanks of tools not relating to the operation performed by the tool
- B23B2231/0216—Overall cross sectional shape of the shank
- B23B2231/022—Triangular
- B23B2231/0224—Rounded triangular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2240/00—Details of connections of tools or workpieces
- B23B2240/08—Brazed connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2240/00—Details of connections of tools or workpieces
- B23B2240/16—Welded connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/20—Number of cutting edges
- B23B2251/202—Three cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2265/00—Details of general geometric configurations
- B23B2265/32—Polygonal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/78—Tool of specific diverse material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/907—Tool or Tool with support including detailed shank
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/909—Having peripherally spaced cutting edges
Definitions
- the present invention relates to a drill bit according to the preamble of claim 1 having a cutting blade tip made of cemented carbide which is united tightly to a tip end side of a bit body of the drill bit by brazing, welding, or the like.
- This invention relates in particular to a drill bit which is simple in design but is high in rigidity and which is capable of effective ejection of cutting chips created when drilling holes in materials such as concrete, stone, and so forth.
- a special drill bit is attached to a drilling machine, e.g., a rotary hammer drilling machine, and either cutting by rotation or drilling by action of simultaneous application of a vibrational striking force in axial direction and a rotational torque is carried out.
- a drilling machine e.g., a rotary hammer drilling machine
- drill bits of the type having a cutting blade tip of cemented carbide superior in resistance to abrasion which is united tightly to a tip end side of a steal bit body of the drill bit by brazing, welding, or the like have been used extensively.
- the following configuration has been employed in many cases. That is, a standardized shank portion conforming to the drive shaft is extendedly formed in a base portion of the bit body, and chip ejection grooves are formed in the outer peripheral surface of the bit body in association with cutting blade portions of the cutting blade tip, respectively.
- cutting impact cutting
- the blade tip of a drill bit momentarily surfaces from a drill hole cutting surface and immediately thereafter starts impactingly knocking the drill hole cutting surface
- the movement of the drill bit in the longitudinal direction of the shaft of the drill bit during such knocking action also helps a lots of chips to be ejected out through a clearance defined between the bit body and the drill hole.
- US 5,664,914 discusses a drill having a cylindrical holding section 13, a hexagonal prismal section 15, and a top-truncated, hexagonal pyramidal section 17.
- the top-truncated pyramidal section 17 has six end faces 29 which taper and converge on the axis of rotation of the drill and six end ridges defined by the meeting of the adjoining two end faces.
- the holding section is smaller in diameter than the prismal section.
- WO 98/54435 discusses a drilling tool having a drill head, a helical shank and a clamping shank formed using a hexagonal steel. A conveying helix groove is introduced by cutting away chips from the hexagonal profile extending over the clamping shank and the helical shank.
- US 2,260,288 discusses a drill having a triangular or square cross-section.
- an object of this invention is to provide, as a drill bit for use in drilling holes in materials such as concrete and stone, a drill bit whose drilling function easily stands comparison with that of conventional drill bits, which is simple in design to provide improved productivity, and which is high in bit body rigidity to provide improved durability, which is particularly suitable for drill bits for drilling holes of small diameter.
- the drilling function of the drill bit formed in accordance with the present invention is in no way inferior to that of conventional drill bits.
- the drill bit of the present invention is manufactured just by tightly uniting a cutting blade tip comprising a block body to the tip end of a bit body of a given length which has no chip ejection groove and which is formed into a straight configuration having a polygonal cross section, thereby being superior in productivity at the time of manufacture.
- the bit body has a straight configuration having a polygonal cross section and differs from conventional circular ones in that it has no chip ejection groove and by having a rectangular cross section, it is possible to eliminate a "notch effect" known in the field of the strength of materials.
- the drill bit of the present invention will not undergo a drop in the rigidity in comparison with conventional circular drill bits and is therefore particularly suitably used as a drill bit for small diameter hole drilling which is susceptible to breakage during drilling operations. And, the drill bit of the present invention is less subject to breakage and is superior in durability, regardless of small diameter or large diameter, and the present invention provides drill bits (products) of high quality. Furthermore, as described above, the drill bit of the present invention is suitable for improving productivity and can be provided inexpensively.
- the drill bit of the present invention employs such a construction that three cutting blade portions are formed around the cutting blade tip so that its bit body is formed into a straight configuration having a triangular cross section, this makes it possible to provide a practically optimal embodiment manner in which rotation during drilling is well balanced, each cutting blade portion exhibits effective cutting properties, and the bit body exhibits highly reliable rigidity.
- each cutting blade portion is projected slightly beyond the bit body surface to form a stepped portion at an area where the bit body and the cutting blade tip are united together tightly, the action of upwardly scratching chips present in a drill hole is further promoted by the stepped portion of each cutting blade portion which projects outwardly from the bit body.
- the drill bit described above employs such a construction that a connecting line of a cutting surface and a flank surface which are formed in each cutting blade portion of the cutting blade tip acts as a cutting edge and these cutting edges are connected together at a blade tip point so that the blade tip point is shaped like a peak without any chisel point, adjoining cutting edges of these cutting edges cooperate to effectively crush chips of large size created in the cutting surface of a drill hole into small particles.
- This provides a construction capable of reducing biased resistance that the blade tip will receive, of making the drill bit free from run-out, and of enabling the blade tip point shaped like a peak to always lie in the center of the cutting surface of the drill hole.
- the roundness of drill holes drilled by the drill bit of the present invention is improved and it becomes possible to drill constant-diameter holes at high accuracy.
- the drill bit of the present invention may employ such a construction that, as in a general-purpose drill, a standardized shank is additionally formed at a base portion of the bit body.
- a standardized shank is additionally formed at a base portion of the bit body.
- the drill bit of the present invention is applicable, of course, to rotary hammer drilling machines and vibration drilling machines as well as to rotary drilling machines.
- a drill bit has a bit body 1 and a cutting blade tip 2 which comprises a block body.
- the material of the bit body 1 is steel and the cutting blade tip 2 made of cemented carbide is tightly united to a tip end (a lower end) of the bit body 1.
- three cutting blade portions 2a, 2b and 2c are formed circumferentially equidistantly around the cutting blade tip 2 .
- an arrangement, not shown in Figure, may be made in which the three cutting blade portions 2a, 2b and 2c are formed circumferentially, approximately equidistantly around the cutting blade tip 2 or are formed circumferentially unequidistantly around the cutting blade tip 2 .
- each cutting blade portion 2a, 2b and 2c Formed in each cutting blade portion 2a, 2b and 2c are a cutting surface 4 and a flank surface 5 .
- a connection line of the cutting surface 4 and the flank surface 5 acts as a cutting edge 6 .
- the cutting edges 6 are joined together at a blade tip point 7 so that the blade tip point 7 is shaped like a peak without any chisel point.
- a flat surface portion 3 whose start edge is between adjacent cutting blade portions of the cutting blade portions 2a, 2b arid 2c of the cutting blade tip 2 and whose end edge is a base end of the bit body 1 , is formed in a side surface of the drill bit.
- a flat surface 3A is formed in a side surface area defined between two adjacent cutting blade portions of the cutting blade portions 2a, 2b and 2c, whereas a flat surface 3B in stepped connection with the flat surface 3A is formed into a straight configuration extending from the tip end to the base end of the bit body 1 along the longitudinal direction thereof.
- the cross section of the drill bit from the base end to the rear end of each cutting blade portion 2a, 2b and 2c is polygonal, for example, "a triangular shape" in the present embodiment , that is, a triangular shape in which a corner at which each flat surface 3B is connected to the other is round.
- each cutting blade portion 2a, 2b and 2c is made to project, toward the outside (toward the outside diameter), slightly beyond the outer peripheral surface of the bit body 1 so that a stepped portion 8 is formed over the entire periphery of an area where said bit body and said cutting blade tip are united together tightly (see Figs. 1 , 2 ).
- a shank portion for connection with a drilling machine is not formed at the base of the bit body 1.
- the drill bit is formed into a straight configuration from its connecting portion to the cutting blade tip 2 up to a sectional end 1a of the base of the bit body 1.
- a shank portion 10 may be formed at the base of the bit body 1 .
- the present embodiment is excellent because it not only reduces the time taken for drill bit change but also provides a reliable hold (connection).
- the drill bit may have any polygonal cross section.
- the drill bit may have a cross section defined by concave surface portions 13B of curvature surfaces, in place of a cross section defined by the flat surface portions 3B of Figures 1 and 3 .
- the cutting blade tip also has a cross section defined by concave surface portions similar to the concave surface portions 13B , in place of a cross section defined by the flat surface portions 3A.
- concave surface portions 13B each comprising a curvature surface and a flat surface may be used.
- the cutting blade tip also has a cross section defined by concave surface portions similar to the concave surface portions 13B, in place of a cross section defined by the flat surface portions 3A.
- the cross section may be other polygonal figures, for example, a rectangular figure and a pentagonal figure.
- the present invention is not limited to such a construction.
- a connecting surface (not shown) in an adequate form may be formed between the cutting surface 4 and the flank surface 5 between each cutting blade portion 2a, 2b and 2c.
- the base portion of the bit body 1 having a polygonal cross section and formed into a straight configuration is directly held by a chuck mounted onto the drive shaft of a rotary hammer drilling machine (or a vibration drilling machine), whereby drilling a hole or holes in materials such as concrete and stone cab be carried out.
- a rotary hammer drilling machine or a vibration drilling machine
- it can be mounted in a mounting hole of the drive shaft.
- the blade tip point 7 is shaped like a peak without any chisel point, so that during drilling operations accompanying impact cutting, the blade tip point 7 having such a peak-like structure always lies in the center of a drill hole cutting surface, thereby making it possible to drill constant-diameter holes at high accuracy.
- the present invention can be carried out in manners as described above, and the drill bit of the present invention can be used by being mounted in place of a conventional drill bit, without changing a chuck or the like of a rotary hammer drilling machine.
- the drilling function of the drill bit of the present invention is in no way inferior to that of conventional drill bits.
- the drill bit of the present invention employs the following "simple" design. That is, unlike conventional circular drill bits, the drill bit of the present invention has no spiral chip ejection groove, and a cutting blade tip formed of a block body is united tightly to a tip end of a bit body having a given length and formed into a straight configuration having a polygonal cross section. As a result of such a design, it is possible to achieve excellent productivity, and excellent durability because there is no drop in the rigidity due to the provision of chip ejection grooves. Further, it is possible to provide inexpensive drill bits.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Drilling Tools (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Earth Drilling (AREA)
- Holo Graphy (AREA)
- Surgical Instruments (AREA)
Abstract
Description
- The present invention relates to a drill bit according to the preamble of
claim 1 having a cutting blade tip made of cemented carbide which is united tightly to a tip end side of a bit body of the drill bit by brazing, welding, or the like. This invention relates in particular to a drill bit which is simple in design but is high in rigidity and which is capable of effective ejection of cutting chips created when drilling holes in materials such as concrete, stone, and so forth. - In drilling holes in materials such as concrete and stone, a special drill bit is attached to a drilling machine, e.g., a rotary hammer drilling machine, and either cutting by rotation or drilling by action of simultaneous application of a vibrational striking force in axial direction and a rotational torque is carried out. And, in order to meet the demand for higher efficiency in such a type of drilling work, drill bits of the type having a cutting blade tip of cemented carbide superior in resistance to abrasion which is united tightly to a tip end side of a steal bit body of the drill bit by brazing, welding, or the like, have been used extensively. Further, like a general-purpose drill, the following configuration has been employed in many cases. That is, a standardized shank portion conforming to the drive shaft is extendedly formed in a base portion of the bit body, and chip ejection grooves are formed in the outer peripheral surface of the bit body in association with cutting blade portions of the cutting blade tip, respectively.
- On the other hand, during drilling operations against materials such as concrete and stone by use of the drill bit, i.e., during drilling work (cutting work), lots of powder/particle-like chips are created. However, these cutting chips are not always ejected out through the chip ejection grooves of the bit body.
- Particularly, when drilling a hole using a rotary hammer drilling machine or a vibration drilling machine, cutting (impact cutting), in which the blade tip of a drill bit momentarily surfaces from a drill hole cutting surface and immediately thereafter starts impactingly knocking the drill hole cutting surface, is carried out. And, the movement of the drill bit in the longitudinal direction of the shaft of the drill bit during such knocking action also helps a lots of chips to be ejected out through a clearance defined between the bit body and the drill hole.
- Further, for the case of rotary hammer drilling machines or for the case of vibration drilling machines, even when chips of relatively large particle size are created on a drill hole cutting surface, they are ground into small particles while impact cutting is repeatedly carried out on the drill hole cutting surface. Therefore, the situation that chips of large particle size remain in a drill hole to cause interference with drilling operations hardly occurs.
- However, for the case of drill bits of small bit diameter, e.g., for the case of a drill bit whose bit diameter is not more than about 6 mm and which is provided with chip ejection grooves formed helically around the outer peripheral surface of a drill body, the rigidity of the drill bit falls because of the formation of the chip ejection grooves. This increases the rate of breakage during drilling operations. Particularly, for the case of drilling operations with a rotary hammer drilling machine or with a vibration drilling machine in which impact force in the longitudinal direction of the shaft is applied, the rate of breakage becomes high.
-
US 5,664,914 discusses a drill having a cylindrical holding section 13, a hexagonal prismal section 15, and a top-truncated, hexagonal pyramidal section 17. The top-truncated pyramidal section 17 has six end faces 29 which taper and converge on the axis of rotation of the drill and six end ridges defined by the meeting of the adjoining two end faces. In the embodiment of figure 15, which discloses a drill in accordance with the preamble ofclaim 1, the holding section is smaller in diameter than the prismal section. -
WO 98/54435 US 2,260,288 discusses a drill having a triangular or square cross-section. - Under the circumstances, the invention as described in
claim 1 was made. Accordingly, an object of this invention is to provide, as a drill bit for use in drilling holes in materials such as concrete and stone, a drill bit whose drilling function easily stands comparison with that of conventional drill bits, which is simple in design to provide improved productivity, and which is high in bit body rigidity to provide improved durability, which is particularly suitable for drill bits for drilling holes of small diameter. - Aspects of the invention are set out in the accompanying claims.
- In accordance with
claim 1, when drilling holes in materials such as concrete and stone, there is defined a larger clearance between the bit body formed into a straight configuration having a polygonal cross section and a drill hole in comparison with drilling by a convention drill bit having a circular cross section. Accordingly, the motion of the drill bit in the longitudinal direction of the shaft also helps powder/particle-like chips created at the tip end to travel upward from the tip end through the clearance and to be smoothly ejected out of the drill hole. The action of upwardly scratching chips present in a drill hole is further promoted by the stepped portion of each cutting blade portion which projects outwardly from the bit body, at the time of impact cutting in which the drill bit moves in the direction of the shaft axis. This provides a construction suitable for the release of chips. - Therefore, the drilling function of the drill bit formed in accordance with the present invention is in no way inferior to that of conventional drill bits. Further, the drill bit of the present invention is manufactured just by tightly uniting a cutting blade tip comprising a block body to the tip end of a bit body of a given length which has no chip ejection groove and which is formed into a straight configuration having a polygonal cross section, thereby being superior in productivity at the time of manufacture. Further, since the bit body has a straight configuration having a polygonal cross section and differs from conventional circular ones in that it has no chip ejection groove and by having a rectangular cross section, it is possible to eliminate a "notch effect" known in the field of the strength of materials. Accordingly, the drill bit of the present invention will not undergo a drop in the rigidity in comparison with conventional circular drill bits and is therefore particularly suitably used as a drill bit for small diameter hole drilling which is susceptible to breakage during drilling operations. And, the drill bit of the present invention is less subject to breakage and is superior in durability, regardless of small diameter or large diameter, and the present invention provides drill bits (products) of high quality. Furthermore, as described above, the drill bit of the present invention is suitable for improving productivity and can be provided inexpensively.
- If the drill bit of the present invention employs such a construction that three cutting blade portions are formed around the cutting blade tip so that its bit body is formed into a straight configuration having a triangular cross section, this makes it possible to provide a practically optimal embodiment manner in which rotation during drilling is well balanced, each cutting blade portion exhibits effective cutting properties, and the bit body exhibits highly reliable rigidity.
- Further, since the drill bit described above employs such a construction that the outer end of each cutting blade portion is projected slightly beyond the bit body surface to form a stepped portion at an area where the bit body and the cutting blade tip are united together tightly, the action of upwardly scratching chips present in a drill hole is further promoted by the stepped portion of each cutting blade portion which projects outwardly from the bit body.
- Furthermore, if the drill bit described above employs such a construction that a connecting line of a cutting surface and a flank surface which are formed in each cutting blade portion of the cutting blade tip acts as a cutting edge and these cutting edges are connected together at a blade tip point so that the blade tip point is shaped like a peak without any chisel point, adjoining cutting edges of these cutting edges cooperate to effectively crush chips of large size created in the cutting surface of a drill hole into small particles. This provides a construction capable of reducing biased resistance that the blade tip will receive, of making the drill bit free from run-out, and of enabling the blade tip point shaped like a peak to always lie in the center of the cutting surface of the drill hole. As a result, the roundness of drill holes drilled by the drill bit of the present invention is improved and it becomes possible to drill constant-diameter holes at high accuracy.
- Further, the drill bit of the present invention may employ such a construction that, as in a general-purpose drill, a standardized shank is additionally formed at a base portion of the bit body. In such a case, it is possible to adequately change and attach drill bits of different diameters to a drive shaft (a single rotary hammer drilling machine) as a common drill bit mount. This therefore provides a drill bit capable of quick change. However, even for the case of a drill bit of the present invention without additional formation of a shank, it is possible to directly and readily hold (connect) the base portion of the bit body formed into a straight configuration having a polygonal cross section by a chuck structure mounted onto the drive shaft of a general rotary hammer drill. In this case, since it is sufficient that a base potion of the bit body of the drill bit be simply cut to a desired length to form a sectional end, it is possible to reduce the number of process steps required in the manufacture of drill bits, to save material, and to provide inexpensive drill bits. Additionally, the weight of a drill bit itself is reduced, thereby improving portability.
- Further, the drill bit of the present invention is applicable, of course, to rotary hammer drilling machines and vibration drilling machines as well as to rotary drilling machines.
-
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Figure 1 is an entire perspective view of a drill bit showing an exemplary embodiment of the present invention. -
Figure 2 is a side view of the drill bit shown inFigure 1 . -
Figure 3 is a top view of the drill bit shown inFigure 1 . -
Figure 4 is a bottom view of the drill bit shown inFigure 1 . -
Figure 5 is a side view of a drill bit according to an exemplary embodiment which differs from the embodiment shown inFigures 1-4 in that its bit body is provided with a special shank portion. -
Figure 6 is a Figure showing cross sections of bit bodies according to exemplary embodiments different from the embodiment shown inFigures 1-4 , whereinFigure 6(a) is a cross-sectional view of a bit body in which a concave surface portion is formed in a drill bit side surface whereasFigure 6(b) is a cross-sectional view of a bit body in which a concave surface portion different from the one shown inFigure 6(a) is formed in a drill bit side surface. - Hereinafter, a first exemplary embodiment of a drill bit according to the present invention will be described in conjunction with the Figures.
- As shown in
Figures 1-4 , a drill bit has abit body 1 and acutting blade tip 2 which comprises a block body. The material of thebit body 1 is steel and thecutting blade tip 2 made of cemented carbide is tightly united to a tip end (a lower end) of thebit body 1. - As shown in
Figure 4 , threecutting blade portions cutting blade tip 2. Alternatively, an arrangement, not shown in Figure, may be made in which the threecutting blade portions cutting blade tip 2 or are formed circumferentially unequidistantly around thecutting blade tip 2. - Formed in each
cutting blade portion cutting surface 4 and aflank surface 5. A connection line of thecutting surface 4 and theflank surface 5 acts as acutting edge 6. Thecutting edges 6 are joined together at ablade tip point 7 so that theblade tip point 7 is shaped like a peak without any chisel point. - As shown in
Figures 4 and1 , aflat surface portion 3, whose start edge is between adjacent cutting blade portions of thecutting blade portions cutting blade tip 2 and whose end edge is a base end of thebit body 1, is formed in a side surface of the drill bit. In other words, in the present embodiment aflat surface 3A is formed in a side surface area defined between two adjacent cutting blade portions of thecutting blade portions flat surface 3B in stepped connection with theflat surface 3A is formed into a straight configuration extending from the tip end to the base end of thebit body 1 along the longitudinal direction thereof. - And, by virtue of the three
flat surfaces 3A and the threeflat surfaces 3B, the cross section of the drill bit from the base end to the rear end of eachcutting blade portion flat surface 3B is connected to the other is round. - When the
bit body 1 and thecutting blade tip 2 are tightly united together, an outer end of eachcutting blade portion bit body 1 so that a steppedportion 8 is formed over the entire periphery of an area where said bit body and said cutting blade tip are united together tightly (seeFigs. 1 ,2 ). - In the drill bit, a shank portion for connection with a drilling machine is not formed at the base of the
bit body 1. In other words, as described above, the drill bit is formed into a straight configuration from its connecting portion to thecutting blade tip 2 up to asectional end 1a of the base of thebit body 1. - However, as shown in
Figure 5 , ashank portion 10 may be formed at the base of thebit body 1. In this case, it is possible to adequately and switchably use drill bits of different diameters with respect to a special mounting hole of a drive shaft side for the mounting of a drill bit. The present embodiment is excellent because it not only reduces the time taken for drill bit change but also provides a reliable hold (connection). - Further, the drill bit may have any polygonal cross section. For example, as shown in
Figure 6(a) , the drill bit may have a cross section defined byconcave surface portions 13B of curvature surfaces, in place of a cross section defined by theflat surface portions 3B ofFigures 1 and3 . In such a case, preferably the cutting blade tip also has a cross section defined by concave surface portions similar to theconcave surface portions 13B, in place of a cross section defined by theflat surface portions 3A.
Alternatively, as shown inFigure 6(b) ,concave surface portions 13B each comprising a curvature surface and a flat surface may be used. In such a case, preferably the cutting blade tip also has a cross section defined by concave surface portions similar to theconcave surface portions 13B, in place of a cross section defined by theflat surface portions 3A.
Further, other than the above described triangular cross sections, the cross section may be other polygonal figures, for example, a rectangular figure and a pentagonal figure. - In the foregoing exemplary embodiment, it is constructed such that the cutting
surface 4 and theflank surface 5 between adjacent cutting blade portions of thecutting blade portions cutting blade tip 2 are directly connected together. However, the present invention is not limited to such a construction. Alternatively, instead of employing such a construction, a connecting surface (not shown) in an adequate form may be formed between the cuttingsurface 4 and theflank surface 5 between each cuttingblade portion - And, when a drill bit having the above-described construction is used, the base portion of the
bit body 1 having a polygonal cross section and formed into a straight configuration is directly held by a chuck mounted onto the drive shaft of a rotary hammer drilling machine (or a vibration drilling machine), whereby drilling a hole or holes in materials such as concrete and stone cab be carried out. Further, for the case of a drill bit with theshank portion 10 ofFigure 5 , it can be mounted in a mounting hole of the drive shaft.
And, in drilling holes in materials such as concrete and stone, powder/particle-like chips created in a drill hole are smoothly ejected out of the drill hole through a clearance defined between thebit body 1 and the drill hole by the movement of the drill bit in the longitudinal direction of the shaft (hammering operation) and by the upward scratching action of the steppedportion 8 formed in the outer end of eachcutting blade portion cutting edges 6 extend radially from theblade tip point 7. Therefore, theblade tip point 7 is shaped like a peak without any chisel point, so that during drilling operations accompanying impact cutting, theblade tip point 7 having such a peak-like structure always lies in the center of a drill hole cutting surface, thereby making it possible to drill constant-diameter holes at high accuracy. On the other hand, for the case of rotary drilling machines, there occurs no movement in the shaft axis direction and cutting operations are performed by movement in rotational direction, and chips are smoothly ejected out of a drill hole through a clearance defined between thebit body 1 and the drill hole. - The present invention can be carried out in manners as described above, and the drill bit of the present invention can be used by being mounted in place of a conventional drill bit, without changing a chuck or the like of a rotary hammer drilling machine. As a result, in drilling a hole in materials such as concrete and stone, the drilling function of the drill bit of the present invention is in no way inferior to that of conventional drill bits.
- In addition to the above, the drill bit of the present invention employs the following "simple" design. That is, unlike conventional circular drill bits, the drill bit of the present invention has no spiral chip ejection groove, and a cutting blade tip formed of a block body is united tightly to a tip end of a bit body having a given length and formed into a straight configuration having a polygonal cross section. As a result of such a design, it is possible to achieve excellent productivity, and excellent durability because there is no drop in the rigidity due to the provision of chip ejection grooves. Further, it is possible to provide inexpensive drill bits.
Claims (5)
- A drill bit comprising:a cutting blade tip (2) formed of a block body which is united tightly to a tip end of a bit body (1) of said drill bit and a plurality of cutting blade portions (2a,2b,2c) which are formed circumferentially around said cutting blade tip (2),
wherein the cutting blade tip (2) comprises a flat surface portion (3A) or a concave surface portion (13A) extending in the direction of the length of the drill bit formed in a side surface of said cutting blade tip (2) from between adjacent cutting blade portions (2a,2b,2c) of said plural cutting blade portions to a base portion of said cutting blade tip (2), andan outer end of each said cutting blade portion (2a,2b,2c) is made to project slightly beyond the surface of said bit body (1) to form a stepped portion (8) over the entire periphery of an area where said bit body (1) and said cutting blade tip (2) are united together tightly,
characterized in that said bit body (1) comprises a flat surface portion (3B) or a concave surface portion (13B) aligned with said flat or concave surface portion (3A,13A) of the cutting blade tip (2) and extending in the direction of the length of said bit body (1) from the area where said bit body (1) and said cutting blade tip (2) are united tightly together to a base portion of said bit body (1), and said bit body (1) is formed into a straight configuration having a polygonal cross-section. - A drill bit according to claim 1, wherein three cutting blade portions (2a,2b,2c) are formed around said cutting blade tip (2) so that said bit body (1) is formed into a straight configuration having a triangular cross section.
- A drill bit according to either claim 1 or claim 2, wherein a connecting line of a cutting surface (4) and a flank surface (5) which are formed in each said cutting blade portion (2a,2b,2c) of said cutting blade tip (2) acts as a cutting edge (6) and wherein said cutting edges (6) are connected together at a blade tip point (7) so that said blade tip point (7) is shaped like a peak without any chisel point.
- A drill bit according to any one of the preceding claims, wherein said base portion of the bit body (1) is cut to a desired length to form a sectional end for setting the total length of said drill bit.
- A drill bit according to any one of the preceding claims, wherein said polygonal cross-section has rounded corners.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000037718 | 2000-02-16 | ||
JP2000037718 | 2000-02-16 | ||
PCT/JP2000/008662 WO2001060557A1 (en) | 2000-02-16 | 2000-12-07 | Drill bit |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1275457A1 EP1275457A1 (en) | 2003-01-15 |
EP1275457A4 EP1275457A4 (en) | 2004-07-28 |
EP1275457B1 true EP1275457B1 (en) | 2010-04-21 |
Family
ID=18561568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00979974A Expired - Lifetime EP1275457B1 (en) | 2000-02-16 | 2000-12-07 | Drill bit |
Country Status (12)
Country | Link |
---|---|
US (1) | US7097396B1 (en) |
EP (1) | EP1275457B1 (en) |
JP (1) | JP3796445B2 (en) |
CN (1) | CN1197676C (en) |
AT (1) | ATE464965T1 (en) |
AU (2) | AU1733401A (en) |
CA (1) | CA2399353C (en) |
DE (1) | DE60044264D1 (en) |
ES (1) | ES2357613T3 (en) |
HK (1) | HK1054713A1 (en) |
TW (1) | TW479005B (en) |
WO (1) | WO2001060557A1 (en) |
Families Citing this family (12)
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DE10239422A1 (en) * | 2002-08-28 | 2004-03-18 | Hartmetall-Werkzeugfabrik Paul Horn Gmbh | Machining tool |
DE102006000208A1 (en) * | 2006-04-28 | 2007-10-31 | Hilti Ag | Rotary hammer drill with four-turn drill bit shank |
US7861807B2 (en) * | 2008-12-03 | 2011-01-04 | Black & Decker Inc. | Drill bit including one piece cutting head |
US9238272B2 (en) * | 2010-12-28 | 2016-01-19 | Toyota Jidosha Kabushiki Kaisha | Drill |
DE102011076890A1 (en) * | 2011-06-01 | 2012-12-06 | Swg Schraubenwerk Gaisbach Gmbh | drill |
DE102012015370A1 (en) | 2012-08-03 | 2014-02-06 | Irwin Industrial Tool Co. | Drill head for drill bit such as rock drill, has free cutting surface with three main cutting edges, and set of points of intersections, where radial distances of points of intersections with regard to working rotation axis are different |
US9695640B2 (en) | 2012-08-03 | 2017-07-04 | Irwin Industrial Tool Company | Drill head for a drill and drill |
DE102012015369A1 (en) | 2012-08-03 | 2014-02-06 | Irwin Industrial Tool Co. | Solid metal made drill bit for drill such as rock drill, has main drilling dust removal sectors having main sector angle, which are defined adjacently by rectilinear extending directions of main cutting edges |
USD734460S1 (en) * | 2012-09-07 | 2015-07-14 | Bien-Air Holding Sa | Shank for surgical drill |
USD734790S1 (en) * | 2013-06-12 | 2015-07-21 | Element Six (Production) (Pty) Ltd | Drill bit tip |
EP4023375A4 (en) * | 2019-08-27 | 2022-10-26 | Sumitomo Electric Hardmetal Corp. | Drill |
US11321506B2 (en) * | 2019-09-17 | 2022-05-03 | Regents Of The University Of Minnesota | Fast algorithm to simulate the response of PDC bits |
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US1136987A (en) * | 1913-06-16 | 1915-04-27 | Samuel Peck | Impact rotary drill. |
US1964030A (en) * | 1931-08-26 | 1934-06-26 | Abbott P Brush | Drill |
US2260288A (en) * | 1940-12-07 | 1941-10-28 | Lester G Black | Drill for penetrating hard metals |
US2404048A (en) * | 1944-08-05 | 1946-07-16 | Franklin G Gepfert | Drill |
US2404049A (en) * | 1944-08-30 | 1946-07-16 | Franklin G Gepfert | Drill |
US2673716A (en) * | 1950-09-02 | 1954-03-30 | Clyde E Avery | Bit |
US2640379A (en) * | 1951-11-28 | 1953-06-02 | Graves Mark | Drill |
US2876995A (en) * | 1954-09-02 | 1959-03-10 | Sr Francis M Neighly | Percussion drills |
US3564948A (en) * | 1968-12-06 | 1971-02-23 | Illinois Tool Works | Drill |
JPS5537284Y2 (en) * | 1972-06-09 | 1980-09-02 | ||
US4160616A (en) * | 1977-10-03 | 1979-07-10 | Winblad Michael E | Drill containing minimum cutting material |
US4383784A (en) * | 1980-01-07 | 1983-05-17 | Precision Twist Drill & Machine Co. | Method and means of manufacturing a rotary cutting tool |
JPS6347815A (en) | 1986-08-18 | 1988-02-29 | Canon Inc | Electronic typewriter |
JPS6347815U (en) * | 1986-09-13 | 1988-03-31 | ||
DE3707798A1 (en) * | 1987-03-11 | 1988-09-22 | Hawera Probst Kg Hartmetall | ROCK DRILL |
DE3742661A1 (en) * | 1987-12-16 | 1989-07-13 | Hawera Probst Kg Hartmetall | ROCK DRILL |
SE461024B (en) * | 1988-06-23 | 1989-12-18 | Sandvik Ab | DRILL |
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DE4407119A1 (en) * | 1993-12-11 | 1995-06-14 | Hawera Probst Kg Hartmetall | Rock drill |
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JP3307809B2 (en) * | 1995-10-05 | 2002-07-24 | 兼房株式会社 | Rotary tool with shank |
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DE19722519A1 (en) | 1997-05-30 | 1998-12-03 | Hawera Probst Gmbh | Drilling tool |
DE19810193A1 (en) * | 1998-03-10 | 1999-09-16 | Hilti Ag | Drilling tool |
JP3895904B2 (en) * | 2000-05-30 | 2007-03-22 | 株式会社ミヤナガ | Drill bit |
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JP3739048B2 (en) * | 2002-11-01 | 2006-01-25 | 株式会社ミヤナガ | Drill bit |
-
2000
- 2000-07-12 US US10/203,508 patent/US7097396B1/en not_active Expired - Lifetime
- 2000-12-06 TW TW089125950A patent/TW479005B/en not_active IP Right Cessation
- 2000-12-07 EP EP00979974A patent/EP1275457B1/en not_active Expired - Lifetime
- 2000-12-07 CN CNB008189579A patent/CN1197676C/en not_active Expired - Lifetime
- 2000-12-07 CA CA002399353A patent/CA2399353C/en not_active Expired - Fee Related
- 2000-12-07 WO PCT/JP2000/008662 patent/WO2001060557A1/en active IP Right Grant
- 2000-12-07 JP JP2001559638A patent/JP3796445B2/en not_active Expired - Lifetime
- 2000-12-07 AU AU1733401A patent/AU1733401A/en active Pending
- 2000-12-07 AU AU2001217334A patent/AU2001217334B2/en not_active Expired
- 2000-12-07 AT AT00979974T patent/ATE464965T1/en active
- 2000-12-07 DE DE60044264T patent/DE60044264D1/en not_active Expired - Lifetime
- 2000-12-07 ES ES00979974T patent/ES2357613T3/en not_active Expired - Lifetime
-
2003
- 2003-09-26 HK HK03106954A patent/HK1054713A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE464965T1 (en) | 2010-05-15 |
TW479005B (en) | 2002-03-11 |
CA2399353C (en) | 2006-01-17 |
US7097396B1 (en) | 2006-08-29 |
AU1733401A (en) | 2001-08-27 |
CN1434754A (en) | 2003-08-06 |
HK1054713A1 (en) | 2003-12-12 |
JP3796445B2 (en) | 2006-07-12 |
AU2001217334B2 (en) | 2004-12-23 |
EP1275457A4 (en) | 2004-07-28 |
DE60044264D1 (en) | 2010-06-02 |
CA2399353A1 (en) | 2002-10-28 |
CN1197676C (en) | 2005-04-20 |
EP1275457A1 (en) | 2003-01-15 |
WO2001060557A1 (en) | 2001-08-23 |
ES2357613T3 (en) | 2011-04-28 |
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